Sebastian,
I pulled the latest 5.15-rt updates then built/booted them on my Intel NUC. The kernel
seems to perform fine with cyclictest, even on a box that has not had specific tunings
done in the bios. Here's the uname, lspci of the i915 graphics part, lscpu and a cyclictest
run for a few minutes. I'll keep running that kernel and let you know if I encounter any
problems.
Clark
[williams@puck ~]$ uname -a
Linux puck.lan 5.15.2-rt19 #2 SMP PREEMPT_RT Fri Nov 12 15:56:44 CST 2021 x86_64 x86_64 x86_64 GNU/Linux
[williams@puck ~]$ lsmod | grep i915
i915 2875392 39
i2c_algo_bit 16384 1 i915
ttm 81920 1 i915
drm_kms_helper 307200 1 i915
cec 53248 2 drm_kms_helper,i915
drm 622592 9 drm_kms_helper,i915,ttm
video 57344 1 i915
[williams@puck ~]$ lspci -v -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation Comet Lake UHD Graphics (rev 04) (prog-if 00 [VGA controller])
DeviceName: GPU
Subsystem: Intel Corporation Device 2081
Flags: bus master, fast devsel, latency 0, IRQ 146, IOMMU group 1
Memory at 6022000000 (64-bit, non-prefetchable) [size=16M]
Memory at 4000000000 (64-bit, prefetchable) [size=256M]
I/O ports at 3000 [size=64]
Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
[williams@puck ~]$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 39 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 12
On-line CPU(s) list: 0-11
Vendor ID: GenuineIntel
Model name: Intel(R) Core(TM) i7-10710U CPU @ 1.10GHz
CPU family: 6
Model: 166
Thread(s) per core: 2
Core(s) per socket: 6
Socket(s): 1
Stepping: 0
CPU max MHz: 4700.0000
CPU min MHz: 400.0000
BogoMIPS: 3199.92
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clf
lush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm c
onstant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc c
puid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg
fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_time
r aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpc
id_single ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority e
pt vpid ept_ad fsgsbase tsc_adjust sgx bmi1 avx2 smep bmi2 erms invpcid mpx
rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm
ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d a
rch_capabilities
Virtualization features:
Virtualization: VT-x
Caches (sum of all):
L1d: 192 KiB (6 instances)
L1i: 192 KiB (6 instances)
L2: 1.5 MiB (6 instances)
L3: 12 MiB (1 instance)
NUMA:
NUMA node(s): 1
NUMA node0 CPU(s): 0-11
Vulnerabilities:
Itlb multihit: KVM: Mitigation: VMX disabled
L1tf: Not affected
Mds: Not affected
Meltdown: Not affected
Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp
Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Spectre v2: Mitigation; Enhanced IBRS, IBPB conditional, RSB filling
Srbds: Not affected
Tsx async abort: Not affected
[williams@puck ~]$ sudo cyclictest -m -p95 -t -a
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 5.82 3.31 1.43 1/1235 4803
T: 0 ( 4656) P:95 I:1000 C: 131431 Min: 1 Act: 3 Avg: 2 Max: 42
T: 1 ( 4657) P:95 I:1500 C: 87620 Min: 1 Act: 2 Avg: 2 Max: 58
T: 2 ( 4658) P:95 I:2000 C: 65714 Min: 1 Act: 3 Avg: 2 Max: 35
T: 3 ( 4659) P:95 I:2500 C: 52571 Min: 1 Act: 2 Avg: 2 Max: 52
T: 4 ( 4660) P:95 I:3000 C: 43809 Min: 1 Act: 4 Avg: 2 Max: 49
T: 5 ( 4661) P:95 I:3500 C: 37550 Min: 1 Act: 2 Avg: 2 Max: 38
T: 6 ( 4662) P:95 I:4000 C: 32856 Min: 2 Act: 2 Avg: 2 Max: 35
T: 7 ( 4663) P:95 I:4500 C: 29205 Min: 2 Act: 3 Avg: 2 Max: 38
T: 8 ( 4664) P:95 I:5000 C: 26285 Min: 1 Act: 4 Avg: 2 Max: 34
T: 9 ( 4665) P:95 I:5500 C: 23895 Min: 1 Act: 3 Avg: 2 Max: 36
T:10 ( 4666) P:95 I:6000 C: 21903 Min: 2 Act: 4 Avg: 3 Max: 36
T:11 ( 4667) P:95 I:6500 C: 20218 Min: 2 Act: 2 Avg: 3 Max: 38
^C
--
The United States Coast Guard
Ruining Natural Selection since 1790
